Heat radiation reflecting layer system for transparent substrates

The invention concerns a stack of layers reflecting thermal radiation for transparent substrates comprising at least a silver functional layer and on the two faces thereof antiglare layers formed by one or several metallic compounds. The antiglare layers under the silver layer comprises a top partial layer of zinc oxide adjacent to the silver layer and a partial additional beneath the zinc oxide layer, formed by aluminium nitride, under internal tractive stresses. By means of the AlN layer under tractive stresses, the internal compressive stresses present in the ZnO layer can be compensated.